Role of quasicylindrical waves and surface plasmon polaritons on beam shaping with resonant nanogratings in the infrared
Role of quasicylindrical waves and surface plasmon polaritons on beam shaping with resonant nanogratings in the infrared
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DOI：
10.1103/physrevb.89.201415
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发表时间：
2014-05-30
影响因子：
3.7
通讯作者：
Nash, G. R.
中科院分区：
文献类型：
--
作者：
Gan, C. H.;Pugh, J. R.;Nash, G. R.
研究了准柱面波和表面等离子体激元在纳米光栅光束整形中的作用。结果表明，在红外波段，等离子体激元和准柱面波对光栅表面的场有很强的影响。提出了一种将远场测量与快速傅里叶变换相结合来绘制光栅表面场幅值的方法。对于具有小程度的几何不对称性的样品，它示出的变换的虚部（零阶分量为零）可以更好地映射的共振表面波的振幅比全复值变换。我们的研究结果将影响共振纳米光栅的研究，设计和足迹。
The role of quasicylindrical waves and surface plasmon polaritons in beam shaping with resonant nanogratings is investigated. It is shown that the field on the grating surface can be strongly influenced by plasmons and quasicylindrical waves in the infrared. A method that combines far-field measurements with the fast Fourier transform to map the field amplitude at the grating surface is demonstrated. For samples with a small degree of geometric asymmetry, it is shown that the imaginary part of the transform (with null zeroth-order component) can better map the amplitude of the resonant surface waves than the full complex-valued transform. Our results will impact the study, design, and footprint of resonant nanogratings.